Coolant hose connection diagram

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Coolant Hose Connection Diagram

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Radiator

Removing and installing → Radiator, removing and installing
Replace coolant after replacing

2 - Coolant pump

Removing and installing → Coolant pump, removing and installing

3 - Coolant thermostat

Removing and installing → Coolant thermostat, removing and installing
Checking → Thermostat, checking

4 - Heater core

Replace coolant after replacing

5 - Bleeder screw

6 - Expansion tank

With sealing cap
Pressure relief valve in cap, checking

7 - Oil cooler

Replace coolant after replacing
Removing and installing → Oil cooler, removing and installing

8 - After-run coolant pump V51

Only for vehicles in countries with hot climates